Crushing-roll.



T. B. CROWE.

GRUSHING ROLL.

APPLIoATIoN FILED Nov. 7, 191s.

1,090,601, Patented Mar. 17,1914,

\ J. JZ J0 J JU @JQ Q J f/fg J2 J Q J5 JQ THOMAS B. CROWE, OF COLORADOSPRINGS, COLORADO, ASSIGNOR TO PORTLAND GOLD MINING COMPANY, OF COLORADOSPRINGS, COLORADO, .A CORPORATION OF WYOMING.

To all whom 'it may concern:

Be it known that I, THoMAs B. Cnown, a citizen of the United States ofAmerica, and resident of Colorado Springs, El Paso county, Colorado,have invented a certain new and useful improvement in Crushing- Itolls,of which the following is a specification.

My invention relates to improvements in crushing rolls, and moreparticularly to those rolls employed in ore Crushers. I-Ieretofore incrushers of this character in which the ore is ground between tworevolving rolls, difficulty has been experienced owing to the fact thatoften times a piece of ore will become wedged between the rolls, andinstead of being drawn through between the same and crushed, will stickand rub along the surface of the rolls. This tends to wear a corrugationor groove in the roll and thus wears the roll out very quickly.

The object of my invention is to prevent the material from catching inthis manner by providing a groove or roughened surface on the surface ofthe roll, which, when it strikes the piece of ore between the roll,grips the same and draws it through the rolls.

A further feature of my invention is in having these roughened orgrooved portions of the roll formed by a series of holes which are boredlongitudinally through the shell and located radially about the same insuch a manner that as the shell becomes worn down, one hole is broughtto the surface so as to form an open groove, and then as the shell wearsdown past this first hole or groove, the next hole is opened up andforms an operative groove.

My invention will be more readily understood by having reference to theaccompanying drawings in which I have illustrated my invention inconnection with a pair of Crusher rolls mounted in a well known manner.

Figure 1 is a sectional view. Fig. 2 is an end view of the roll shell.Fig. 3 is a sectional view of the shell.

In Fig. 1, I have indicated a pair of rolls 4 4 mounted in any wellknown manner in the housing 5. These shells are held t0- gether byspring pressure produced by the springs 6 6 so that they will giveslightly, as is necessary in the crushing of the ore. This mounting ofthe rolls does not form Specieation of Letters Patent.

Application filed November 7, 1913.

CRUSI-IING-ROLL.

Patented Mar. 17, 1914..

Serial No. 799,655.

any part of my present invention, and any suitable mounting can beemployed, and it is not thought necessary to describe same in detail. At7, I have indicated a `hopper for feeding the material between therolls.

My invention is particularly illustrated in Figs. 2 and 3, in which Ishow the shell 8 which is placed over each of the rolls 4 4. This shellis usually shrunk on to these rolls in the well known manner. Passinglongitudinally through each of these shells 8 are a series of holes 9,10, 11, 12, 13 and 14. yThese holes are usually one-half inch indiameter,

although, of course, the size of the hole depends upon the size of thecrusher and the size of the material being crushed. The first hole 9 ispreferably located just below the surface of the roll, so that as therolls start 1n operation and the ore begins to wear down the surface ofthe shell below the top of the hole 9, this hole becomes an open groovein the surface of the shell. 'Ihus if any piece of ore becomes caughtbetween the two rolls, and this open groove on either of the shellscomes in contact with this piece of ore, it will tend to grip the sameand draw it positively through the rolls and thus pre vent it fromsticking between the rolls and wearing the surface of the same. As thesurface of the shell becomes worn,the groove 9 becomes shallower, untilfinally the surface of the shell is at a point which correspondsoriginally to the bottom of the hole pr groove 9, and thus the surfaceof the shell 1s again smooth. To prevent any ore from sticking at thistime, I provide a second longitudinal hole 10, the top of which hole ison a circumferential line just below the bottom of the first hole 9, andthus when the shell is worn down to the point just mentioned, the hole10 comes into operation and is opened up to form a groove for grippingthe pieces of ore caught between the rolls. Farther around thecircumference of the shell, I provide a third hole 11 which is locatedon a line just below the hole l0, and similar holes 12, 13 and 14, eachlocated just below the preceding hole. It will thus be seen that as fastas one groove becomes worn out, so as to become inoperative, the nexthole is opened up to form a groove and become operative, and thiscontinues until the shell is worn out and has to be replaced by a newshell. Furthermore, it will be seen that the position of the holesaround the circumference in this manner does not tend to weaken theshell as would be the case if a deep groove Were placed at any oneparticular point. These shells are ordinarily about five inches thick,and the holes being but about one-hall:l inch in diameter, they do notweaken the shell to any appreciable eX- tent.

W'hile I have illustrated and described my invention in connection withcrushing rolls mounted in a particular manner, it Will, of course, beunderstood that my invention is not so limited, but on the contrary myinvention relates broadly to a shell for a crushing roll, which roll canbe mounted in any desired manner. Furthermore, it Will be understoodthat the size of the openings `of the holes can be varied to suit theparticular conditions of surface, and the number of these holes can bevaried.

lVhat I claim as my invention is:

l. A crushing roll provided with a cylindrical shell having therein alongitudinal hole located adjacent to the surface of said shell andadapted to be opened up so as to form a longitudinal groove in saidshell as the surface of the shell is Worn out.

2. A crushing roll provided With a cylindrical shell having a pluralityof holes eX tending longitudinally through said shell, and arrangedradially around said shell, and disposed at varying distances from thesurface of said shell.

3. A crushing roll provided With a cylindrical shell having a pluralityof holes eX- tending longitudinally through said shell and arrangedradially around said shell, and disposed at varying distances from thesurface of said shell, the top of one hole being' substantially the samedistance from the sur face of said shell as the bottom of the precedinghole.

Signed by me at Colorado Springs, Colorado, this th day of October,1913.

THOS. B. CROVE.

Witnesses: y

H.V. HOLMAN. FRANK A. HAMILTON.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents.

Washington, D. C.

